ipv4: Kill RT_CACHE_DEBUG

It's way past it's usefulness.  And this gets rid of a bunch
of stray ->rt_{dst,src} references.

Even the comment documenting the macro was inaccurate (stated
default was 1 when it's 0).

If reintroduced, it should be done properly, with dynamic debug
facilities.

Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/dst.c

@@ -33,9 +33,6 @@
  * 3) This list is guarded by a mutex,
  *    so that the gc_task and dst_dev_event() can be synchronized.
  */
-#if RT_CACHE_DEBUG >= 2
-static atomic_t			 dst_total = ATOMIC_INIT(0);
-#endif
 
 /*
  * We want to keep lock & list close together
@@ -69,10 +66,6 @@ static void dst_gc_task(struct work_struct *work)
 	unsigned long expires = ~0L;
 	struct dst_entry *dst, *next, head;
 	struct dst_entry *last = &head;
-#if RT_CACHE_DEBUG >= 2
-	ktime_t time_start = ktime_get();
-	struct timespec elapsed;
-#endif
 
 	mutex_lock(&dst_gc_mutex);
 	next = dst_busy_list;
@@ -146,15 +139,6 @@ loop:
 
 	spin_unlock_bh(&dst_garbage.lock);
 	mutex_unlock(&dst_gc_mutex);
-#if RT_CACHE_DEBUG >= 2
-	elapsed = ktime_to_timespec(ktime_sub(ktime_get(), time_start));
-	printk(KERN_DEBUG "dst_total: %d delayed: %d work_perf: %d"
-		" expires: %lu elapsed: %lu us\n",
-		atomic_read(&dst_total), delayed, work_performed,
-		expires,
-		elapsed.tv_sec * USEC_PER_SEC +
-		  elapsed.tv_nsec / NSEC_PER_USEC);
-#endif
 }
 
 int dst_discard(struct sk_buff *skb)
@@ -205,9 +189,6 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
 	dst->lastuse = jiffies;
 	dst->flags = flags;
 	dst->next = NULL;
-#if RT_CACHE_DEBUG >= 2
-	atomic_inc(&dst_total);
-#endif
 	dst_entries_add(ops, 1);
 	return dst;
 }
@@ -267,9 +248,6 @@ again:
 		dst->ops->destroy(dst);
 	if (dst->dev)
 		dev_put(dst->dev);
-#if RT_CACHE_DEBUG >= 2
-	atomic_dec(&dst_total);
-#endif
 	kmem_cache_free(dst->ops->kmem_cachep, dst);
 
 	dst = child;